code: def _create_test_area(
      proj_str=None, shape=DEFAULT_SHAPE, extents=None
  ):
      """Create a test area definition."""
      if proj_str is None:
          proj_str = (
              "+proj=lcc +datum=WGS84 +ellps=WGS84 +lon_0=-95. "
              "+lat_0=25 +lat_1=25 +units=m +no_defs"
          )
      extents = extents or (-1000.0, -1500.0, 1000.0, 1500.0)
  
      return AreaDefinition(
          "test", "test", "test", proj_str, shape[1], shape[0], extents
      )
  
file_path: satpy/satpy/tests/multiscene_tests/test_utils.py
imports: import dask.array
  import numpy
  import xarray
  from pyresample.geometry import AreaDefinition
  from satpy.dataset.dataid import ModifierTuple, WavelengthRange
label_desc: Use image node_id 2 for calling a global function with example usage: _create_test_area(proj_str, shape, extents) and returns: AreaDefinition